v3.26.1
ORGANIZATION AND BASIS OF PRESENTATION - Schedule of Error Corrections related to Statements of Equity (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance   $ 12,510     $ 12,510  
Net income $ 288   $ 268   693 $ 628
Ending balance 12,935       12,935  
JCP&L            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 5,228 5,160 4,986 $ 4,967 5,160 4,967
Net income 79 66 62 47    
Ending balance $ 5,309 $ 5,228 5,049 4,986 $ 5,309 5,049
As Reported | JCP&L            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance     4,998 4,977   4,977
Net income     66 49    
Ending balance     5,065 4,998   5,065
Adjustment | JCP&L            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance     (12) (10)   (10)
Net income     (4) (2)    
Ending balance     $ (16) $ (12)   $ (16)